/*
 * Copyright 1997 Sun Microsystems, Inc.  All Rights Reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Sun designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Sun in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 */

package org.loon.framework.android.game.core.graphics.geom;

import java.util.*;

/**
 * A utility class to iterate over the path segments of a quadratic curve
 * segment through the PathIterator interface.
 * 
 * @author Jim Graham
 */
class QuadIterator implements PathIterator {
	QuadCurve2D quad;
	AffineTransform affine;
	int index;

	QuadIterator(QuadCurve2D q, AffineTransform at) {
		this.quad = q;
		this.affine = at;
	}

	/**
	 * Return the winding rule for determining the insideness of the path.
	 * 
	 * @see #WIND_EVEN_ODD
	 * @see #WIND_NON_ZERO
	 */
	public int getWindingRule() {
		return WIND_NON_ZERO;
	}

	/**
	 * Tests if there are more points to read.
	 * 
	 * @return true if there are more points to read
	 */
	public boolean isDone() {
		return (index > 1);
	}

	/**
	 * Moves the iterator to the next segment of the path forwards along the
	 * primary direction of traversal as long as there are more points in that
	 * direction.
	 */
	public void next() {
		index++;
	}

	/**
	 * Returns the coordinates and type of the current path segment in the
	 * iteration. The return value is the path segment type: SEG_MOVETO,
	 * SEG_LINETO, SEG_QUADTO, SEG_CUBICTO, or SEG_CLOSE. A float array of
	 * length 6 must be passed in and may be used to store the coordinates of
	 * the point(s). Each point is stored as a pair of float x,y coordinates.
	 * SEG_MOVETO and SEG_LINETO types will return one point, SEG_QUADTO will
	 * return two points, SEG_CUBICTO will return 3 points and SEG_CLOSE will
	 * not return any points.
	 * 
	 * @see #SEG_MOVETO
	 * @see #SEG_LINETO
	 * @see #SEG_QUADTO
	 * @see #SEG_CUBICTO
	 * @see #SEG_CLOSE
	 */
	public int currentSegment(float[] coords) {
		if (isDone()) {
			throw new NoSuchElementException(
					"quad iterator iterator out of bounds");
		}
		int type;
		if (index == 0) {
			coords[0] = (float) quad.getX1();
			coords[1] = (float) quad.getY1();
			type = SEG_MOVETO;
		} else {
			coords[0] = (float) quad.getCtrlX();
			coords[1] = (float) quad.getCtrlY();
			coords[2] = (float) quad.getX2();
			coords[3] = (float) quad.getY2();
			type = SEG_QUADTO;
		}
		if (affine != null) {
			affine.transform(coords, 0, coords, 0, index == 0 ? 1 : 2);
		}
		return type;
	}

	/**
	 * Returns the coordinates and type of the current path segment in the
	 * iteration. The return value is the path segment type: SEG_MOVETO,
	 * SEG_LINETO, SEG_QUADTO, SEG_CUBICTO, or SEG_CLOSE. A double array of
	 * length 6 must be passed in and may be used to store the coordinates of
	 * the point(s). Each point is stored as a pair of double x,y coordinates.
	 * SEG_MOVETO and SEG_LINETO types will return one point, SEG_QUADTO will
	 * return two points, SEG_CUBICTO will return 3 points and SEG_CLOSE will
	 * not return any points.
	 * 
	 * @see #SEG_MOVETO
	 * @see #SEG_LINETO
	 * @see #SEG_QUADTO
	 * @see #SEG_CUBICTO
	 * @see #SEG_CLOSE
	 */
	public int currentSegment(double[] coords) {
		if (isDone()) {
			throw new NoSuchElementException(
					"quad iterator iterator out of bounds");
		}
		int type;
		if (index == 0) {
			coords[0] = quad.getX1();
			coords[1] = quad.getY1();
			type = SEG_MOVETO;
		} else {
			coords[0] = quad.getCtrlX();
			coords[1] = quad.getCtrlY();
			coords[2] = quad.getX2();
			coords[3] = quad.getY2();
			type = SEG_QUADTO;
		}
		if (affine != null) {
			affine.transform(coords, 0, coords, 0, index == 0 ? 1 : 2);
		}
		return type;
	}
}
